03385: spacwalk: CPU-controlled character moves wrong at left side.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
03385	Gameplay	Minor	Always	Aug 13, 2009, 12:39	Aug 15, 2009, 16:15

Tester	hap	View Status	Public	Platform
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	midw8080/mw8080bw.cpp
Version	0.133u2	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	03385: spacwalk: CPU-controlled character moves wrong at left side.
Description	The CPU-controlled character moves wrong at the left side of the screen. It looks like, instead of skipping a bit at the middle (see Additional Information), it sets its X position to an invalid area, and the game logic deducts $28 from it, causing it to jump to the left. doesn't affect player-controlled character
Steps To Reproduce	watch attract mode
Additional Information	The abrupt jump (upper left<->lower right, lower left<->upper right) at the middle of the screen is most likely normal. Judged from the astronaut bumping against 'air' when it's at the middle of the screen, the original game probably had an artwork overlay at that spot. (on forums, a rocket is mentioned)
Github Commit

Flags
Regression Version	0.133u1 (added)
Affected Sets / Systems	spacwalk

Attached Files

No.04804 Haze Senior Tester Aug 13, 2009, 13:30	Yeah, I couldn't make any sense of this myself. Somebody should probably check the CPU code, and ensure that there are no bad bits in the ROMs, it's possible they've become corrupt over time, or one of them just needs redumping. This is one of the reasons I marked it as non-working, the movement (and collisions in some areas of the screen) didn't seem to make much sense. I didn't know if it was due to artwork, CPU bugs, or some other problem.
No.04815 hap Developer Aug 15, 2009, 15:54	It's a good dump, changing anything in the ROM will make test mode complain.
No.04816 Haze Senior Tester Aug 15, 2009, 16:15	Chances are it's good then yes, although it's always possible that 2 bad bits can result in the good checksum with these old games and their simple rom checks. I'd say it was unlikely that was the case tho.